Tap wrench



Lit)

Patented Get. 2l, i924.

DAVID B. FULLER, GF GREENFELD, EASSAC-IUSETTS.

Ter Wennen'.

Application filed February 21, 1922. Serial No. 538,286.

I tap wrenches.

It `has for an object to provide a wrench for turning or rotating and securely holding a tap, reamer. and like tools when in. use, and which are provided with the usual square or rectangular shaped gripping shank.

A. further object isto provide a tap .wrench in which the jaws are adjusted by a screw thread having a vtine pitch for providing a iirm grip or hold on the shank of the tool. Y

A. further object is to provide guiding means for the sliding movements of the jaws in order to prevent Vany side play of the j avis eitherwhen in use or during their adjustments in the holder.

A further object is to provide means for holding one of the jaws against movement after the tool 1s inserted and the other jaw `is moved against the tool.

A further object is to provide novel means of attaching the movable jaw to the movable or adjustable handle.

A further object relates to the method of breaching the handles for aligning the jaws by forming grooves with flattened and circular sides.

Further objects and nature of the invention will appear in the body of the specification and will be specifically pointed out in the appended claims.

Referring to the drawings: c;

Fig. 1V is a plan view of the-wrench with the parts in their assembled position.

Fig. 2 is a vertical sectional view in a plane represented by the line 2-2 on Fig. 1 showing the jaws as gripping the square shank of a tool, and the interior structure of the wrench.

Fig. 3 is a transverse sectional view on the line 3-3 of Fig. 1 looking in the direction of the arrows showing one of the guideways in the wrench which are formed with flat and curved surfaces.

Y Fig. t is a perspective detail view of one of the jaws with the disk-shaped end which is always held in a fixed position when the wrench is in use, and n Fig. 5 is a detail view of tneother or movable aw that is moved' toward the shanlr of the tool being gripped.

Referring to the drawings in detail:

1 designatest-he central or body portion of the wrench having the oppositely extending end portions 2 and 3. The portion 2 is internallyT threaded for a portion of its length as indicated at i and the remaining or outer end portion is leftI smooth or without threads7 as indicated at 5.

The right. hand portion 3 is formed with an internal thread for a portion of its length as indicated at 6 and the reinainino` or onter f end` is like thel portion 2a made smooth or without threads as indicated at 7. 8 and 9 are the operating handles which are threaded at their inner ends for engaging the-internal threads -i and 6 respectively. 10V and 11 designate the tool gripping jaws inFigs. 4l and 5 removed from the wrench. `'lhe-jaw 1() isjlzormed with the parallel fiatfaces 12 and 18 and formed with the. oppositely located curved faces 14tand 15 and' one end with the integral disk-shaped piecel7V the radius of ywhich is equal to the radius of the cnrvedfaces. Its other end is formed with the faces 17 and 18 which are arranged at right angles to each other, as shown.H TheA parallel flat faces 12 and 13 engage interi-1V orly located parallel fiat faces 19 and .2O in the body portion 1 when assembled as indicated in Fig. 3 .in section. rlhe curved snrfaees 11i and 15 engage the curved sur.- faees-l and 22 of the body portion 1. rFliese carved snrfaces are indicated in Fig. 1 by the dotted` line. 23 designates a shoulder which is located at theA inner end ofthe r threaded recessed portion of the handle 2 of the `poruoni and against which shoulder the inner surface 24 of thedislr-shaped mein- 4ber 16,*jaw 10, engages when assembled..v

rThe inner end 8 of the handle 8 engages the outer surface of the disk shaped member 16 for firmly retaining the jaw 1() against the shoulder 28. By simply removing the handle 8 the jaw 10 may be removed as readily understood. i

Referring now to the construction andy operation of the other jaw 11. rlhis jaw 11 is like the other or companion jaw 10,

Y formed with the paralleliiat faces 25 and 26 and the oppositely located curved faces 27v and 28. These faces engage correspondingly shaped faces or surfaces in the body portion l as indicated at 29 and 30 and at 3l and 32 respectively. Its inner end is formed with the notched or recessed part B8 having the tool gripping faces 34C and which engage the adjacent faces of the shank of the tool indicated at 36 in place in the wrench. The outer end of the jaw l1 is formed with a T-shaped projection 37. The handle 9is formed with an open ended recess 38 to receive this projection. This construction forms a swivel connection between the jaw ll andthe handle 9. 88 isa slot to receive the shank 37. It is for the purpose of withdrawing the jaw 11' from the holder and for enlarging the space between the inner gripping ends of the two jaws in order to receive shanks of different sizes. By turning the handle 9 left handed the jaw ll may be completely removed. The flat parallel bearing surfaces as well as the curved bearing surfaces in the body portion l for both of the jaws are formed by the broaching process, whereby a very accuratefit for the jaws is obtained. These sliding surfaces also possess the very important advantage of maintaining` accurate alignment of the gripping faces of the jaws and also serve to preventany tendency to rotate or turn thereby eliminating all side play or lost motion which `is a very important feature in the construction of tap wrenches. A very firm grip is therefore maintained by the jaws on the shank 36 of the tool.

In operation, the handles 8 and 9 by reason of their fine pitch screw threads retains the jaws with a firm grip against the shank of the tool. Such a thread is not easily shaken loose when in use.

What I claim is:

l. A tap wrench comprising a body member having oppositely projecting interiorly threaded portions, two jaws in the body member, a shoulder in one of said portions to serve as a stop for one of the jaws, a handle in the said portion Vfor retaining this jaw fixed against the shoulder, a second handle in they threaded body member, the other jaw in the body member being connected to the second handle in the other threaded projecting portion by means of a swivel connection between the second jaw and the second handle, and the jaws having flat cooperating surfaces with the body mem ber to prevent rotary movement of the jaws.

2. In a tap wrench, the combination with a body portion thereof having oppositely located flat and curved surfaces, gripping jaws having correspondingly shaped sur-y faces engaging the same, and operating hair dles threaded into the body portion which engage the gripping jaws for retaining the jaws in place and one of the handles being for adjusting one of the jaws and the other handle being for retaining the other jaw in a xed position but permitting the removal of this jaw when the said other Vhandle is removed from the body portion.

3. A tap wrench having in combination with a body portion which is formed with two pairs of fiat and curved surfaces therein, a shoulder in the portion, clamping jaws engaging the surfaces, handles threaded into the body portion, one of the jaws having a member engaging the shoulder, a handle for retaining this jaw against the shoulder, the other jaw having a swivel connection with the other handle for moving this jaw.

4t. A jaw for a tap wrench having two oppositely curved faces and two oppositely located flat faces, said jaw having an integral disk-shaped piece at one end of a radius equal to the radius of the curved faces and tool gripping faces at its other end.

5. In a tap wrench, the combination, a stock having a centrally located oppositely recessed part, oppositely extending portions connected to the centrally located part and each of said extending portions having an internally threaded portion, operating handles each having a threaded end adjacent thereto for engaging the internally threaded portions, tool gripping jaws in the centrally located part, a shoulder at the inner end of one of the internally threaded portions, one of the jaws having a disk shaped portion at one end which engages the said shoulder and the inner end of one of the operating handles engaging the opposite side of the disk shaped portion for forcing it against the shoulder, the other Vjaw having a T- shaped projection and the other operating handle having anvopen ended recess to receive said projection, whereby when the other operating handle is threaded into the internally threaded part the second or other jaw may be moved towards and away from the other or fixed jaw.

DAVID B. MILLER. 

